Electrochemistry

What is the standard reduction potential (E^o) for Fe³⁺ $\to$ Fe ? Given that : Fe²⁺ + 2e^$-$ $\to$ Fe; $E_{F{e^{2 + }}/Fe}^o$ = $-$0.47 V Fe³⁺ + e^$-$ $\to$ Fe²⁺; $E_{F{e^{3 + }}/F{e^{2 + }}}^o$ = +0.77 V